• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.8A
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• pp.898-908
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• 2004

In this paper, we propose a high speed preamble searcher feasible for RACH(Random Access Channel) preamble structure in WCDMA reverse link receiver. Unlike IS-95, WCDMA system uses AISMA(Acquisition Indication Sense Multiple Access) process. Because of the time limit between RACH preamble transmission and AI(Acquisition Indicators), and the restriction on the number of RACH signatures assigned to RACH preamble, fast acquisition indication is required for efficient operation. The preamble searcher proposed in this paper is based on 2-antenna system and has adopted FHT algorithm that has the radix-2 16 point FFT structure. The acquisition speed using FHT is 64 times faster than the conventional method that correlates each signature. Based on their fast aquisition scheme, we improved the acquisition performance by calculating the correlation up to the 4096 chips of the total preamble length. The performance is analyzed by using Neyman-pearson method. The proposed algorithm has been applied for the implementation of WCDMA reverse link receiver modem successfully.

• The Magazine of the IEIE
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• v.25 no.10
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• pp.73-94
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• 1998

본 논문에서는 한국이 ITU-R에 제출한 DS-CDMA 방식의 TTA proposal I과 II의 특징 및 제안된 기술 중 역방향 변조방법인 OCQPSK(orthogonal complex QPSK), 역방향 공통패킷채널 전송방법인 AISMA(acquisition indication sense multiple access), 그리고 순방향 고속전력제어 알고리즘을 살펴본다.